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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Extended aeration activated sludge process operated under low dissolved oxygen concentration: Kinetic behavior of nitrifying heterotrophic and autotrophic bacteria

Full text
Author(s):
Rodrigo de Freitas Bueno ; Roque Passos Piveli ; Fábio Campos
Total Authors: 3
Document type: Journal article
Source: Engenharia Sanitária e Ambiental; v. 24, n. 5, p. 939-947, Out. 2019.
Abstract

ABSTRACT The objective of this work was to determine the kinetic parameters that describe the growth of heterotrophic and autotrophic nitrifying bacteria in three systems of activated sludge with prolonged aeration, operated with low aeration, with the objective of obtaining nitrogen removal of sanitary sewage by simultaneous nitrification and denitrification (SND). In relation to the removal of organic matter and nitrogen, by using sludge ages ranging from 12 to 20 days and OD concentrations in the reactors around 0.5 mgO2.L-1, it was possible to obtain efficiencies higher than 90% and a sewer treated with nitrate concentrations below 7.0 mgN.L-1. The experiments carried out prove that, under the operating conditions adopted during the respirometric tests, heterotrophic and autotrophic bacteria present in activated sludge were active and, although the low concentration of OD was not limiting for the development of the kinetics of the processes involved in the removal of organic and nitrogenous material. (AU)

FAPESP's process: 12/04235-0 - Optimization of the design and operation of sewage treatment systems by means of activated sludge with extended aeration
Grantee:Rodrigo de Freitas Bueno
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 10/50741-9 - Optimization of the design and operation of sewage treatment systems by means of activated sludge with extended aeration
Grantee:Roque Passos Piveli
Support type: Research Grants - Research Partnership for Technological Innovation - PITE